PLUG-PIPE 9X6399 - Caterpillar

oil from the oil pan flows through a strainer and a pipe to the suction side of the engine oil pump. Engine oil pressure for the lubrication system is supplied by the oil pump. The crankshaft gear drives a lower idler gear. The lower idler gear drives the oil pump gear.The pump has an inner rotor and an outer rotor. The axis of the inner rotor is off-center to the outer rotor. There is an interference fit between the inner rotor and the drive shaft.If a balancer is installed, the engine oil pressure is provided by an integrated engine oil pump. The integrated engine oil pump is located in the balancer.The inner rotor has six lobes which mesh with the seven lobes of the outer rotor. When the pump rotates, the distance increases between the lobes of the outer rotor and the lobes of the inner rotor in order to create suction. When the distance decreases between the lobes, pressure is created, forcing oil into the lubricating system.The lubricating oil flows from the outlet side of the oil pump through a passage to the plate type oil cooler. The oil cooler is located on the left side of the cylinder block. The oil then flows from the oil cooler through a passage to